40 THE NAUTILUS. 



NOTICES OF NEW AMERICAN SNAILS. 



BY H. A. PILSBRY. 



Gastrodonta intertexta volus'.se, n. var. 



Shell small, thin and fragile, siibtranslucent, pale brown, somewhat 

 glossy, tlie surface decussated by impressed spirals cutting fine but 

 sharp stria? above, smoother but still decussate below ; rather widely 

 perforate. Whorls 5-^, the earlier 1^ smooth, last whorl slightly 

 angular at the periphery, quite convex beneath. Aperture without 

 the slightest trace of callus within. Alt. 5, diam. 8 mm. 



Near "Mount Taylor," an aboriginal mound on the St. John's 

 River, south of Volusia, Volusia Co., Florida ; coll. by Pilsbry & 

 Johnson. Types no 7,T,769 coll. A. N. S. P. 



This shell differs from intertexta in the very small size, fragile 

 texture, and total lack of an internal callus within the last whorl 

 near the aperture. Some 56 specimens collected agree in these 

 characters ; and as I have seen no intermediate specimens, the form 

 may prove be specific. However, the St. John's valley is 

 deficient in lime ; the land shells are in some other cases quite thin 

 for their species, a fact which has its weight. But in the Tanners- 

 ville valley of the Catskills, a sandstone region where snails are rare 

 and actually eat each other's shells for lime, the intertexta I found 

 still had the characteristic callus within the mouth. 

 Alexia myosotis marylandica, n. v:ir. 



Inner lip triplicate ; outer lip with a conical tooth at its upper 

 third, below which, it is thickened by a callous rib. 



Mouth of St. Leonard's Creek, Patuxent River, Maryland, col- 

 lected by Charles "NV. Johnson. 

 Pyramidula Elrodi, n. sp. 



Shell openly umbilicate, much depressed and acutely keeled, 

 moderately solid. Spire but slightly convex ; whorls 5, the first 

 smooth, the next 1^ rather convex, finely and regularly ribbed, the 

 following whorls flattened, impressed above an acute keel which fills 

 the suture, the last two whorle very strongly, irregularly ribbed, the 

 ribs running with growth-lines, wrinkle-like ; last whorl with an 

 acute peripheral keel, pinched and concave above and beloiv it, the 

 keel of the preceding whorl projecting more or less above the 

 suture ; base convex, heavily ribbed, the umbilicus large and funnel- 

 shaped. Aperture oblique, irregularly oval, angular at position of 



